CN101497120B - Arrangement method of casting system of aluminium alloy cylinder metal mould low-pressure casting - Google Patents
Arrangement method of casting system of aluminium alloy cylinder metal mould low-pressure casting Download PDFInfo
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- CN101497120B CN101497120B CN2008100333748A CN200810033374A CN101497120B CN 101497120 B CN101497120 B CN 101497120B CN 2008100333748 A CN2008100333748 A CN 2008100333748A CN 200810033374 A CN200810033374 A CN 200810033374A CN 101497120 B CN101497120 B CN 101497120B
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Abstract
The invention relates to a method for arranging a pouring system for metal mold low-pressure casting of an aluminum alloy cylinder body, which relates to a casting technique and is a metal mold low-pressure casting technique for casting the aluminum alloy cylinder body of a diesel engine. The technique adopts the surface of a cylinder body combustion chamber as a pouring gate surface to save a shrink head for feeding shrinkage in conventional gravity casting and a shrink head core which is used as the shrink head and has larger volume, and save the cost. The pouring gate surface adopts four pouring gates which are sequentially solidified on feeding shrinkage termination surfaces to ensure that the cylinder body is solidified from the top down sequentially so as to solve the problems that dispersed shrinkage appears in a cast in the casting process and the structure is not compact enough. All the positioning standards are designed on the surface of the cylinder body combustion chamber;and because all the positioning standards are designed on one surface, the positioning is more accurate, and the problem of imprecise positioning in the casting process is solved.
Description
Technical field
The present invention relates to a kind of foundry engieering, is the metal-mold low-pressure casting technology of casting diesel motor aluminium alloy cylinder.
Background technology
Cylinder block is the sophisticated technology that domestic casting industry is generally acknowledged, the aluminum alloy diesel engine cylinder block is again that it mainly represents one of part, complicated structure, wall thickness difference are big, the characteristics of castingin Cast iron liner and enclosed jacket structure for water, cause this product still can not produce at home and meet performance requirement cast aluminium cylinder block, and in producing defectives such as pore, shrinkage porosite are arranged very easily.
Cylinder block is one of vital part of diesel engine, aluminum alloy diesel engine is again one of light-weighted important symbol of automobile engine, its quality quality directly has influence on the complete machine performance and the service life of diesel engine, so the manufacturing of manufactory's countercylinder body is always paid special attention to.
Adopt cast-in engine cylinder-body for cylinder sleeve, according to the difference of water-cooling structure, the conventional cast mode also can die casting or metal mold gravity casting.For above-mentioned two kinds of forging types, pluses and minuses are arranged respectively.
Die casting: production efficiency height, be fit to production in enormous quantities, casting dimension accuracy height, surface smoothness height, product yield height, can only do open water-cooling channel spare, and the die casting casting mold development time is long, the equipment mould drops into the expense height, have a big risk, be not suitable for doing the complicated part of inner chamber, be not suitable for doing the enclosed water-cooled engine cylinder block, can not do similar diesel engine cylinder block.
Metal mold gravity casting: can in conjunction with core make the inner chamber complexity cylinder of petrol engine, be fit to produce in batches, exploitation input expense is lower than die casting, only is applicable to the regular price gasoline machine.But need be cast into the diesel engine cylinder block of cylinder sleeve type at the enclosed water-cooled, have that mechanical performance can not meet design requirement, cylinder sleeve is not in conjunction with fine and close, seepage, yield rate is on the low side, antiquated sand produces many problems.Want the high diesel engine cylinder body of production technology difficulty, die casting and gravitational casting are impossible, can only use low pressure casting.
Adopt the metal-mold low-pressure casting new technology can solve the deficiency of above-mentioned two kinds of technologies simultaneously, finish the diesel engine cylinders body of making high densification, high-strength aluminum alloy, having enclosed water-cooled, castingin cylinder sleeve.
In the low pressure casting, never have the method for arranging of the casting system of good aluminium alloy cylinder metal mould low-pressure casting, cause that cost is higher, shrinkage porosite, organize problems such as fine and close inadequately, location inaccuracy.Therefore the method for arranging of the casting system of aluminium alloy cylinder metal mould low-pressure casting in the low pressure casting is the problem of restriction aluminium alloy cylinder metal mould low-pressure casting technological development always.
Summary of the invention
The object of the present invention is to provide a kind of method for arranging of casting system of aluminium alloy cylinder metal mould low-pressure casting, according to the casting process needs, determine cylinder block casting position in mould, add ad hoc gas extraction system, make foundry goods fill a part consecutive solidification, solve the shrinkage porosite that exists in the aluminium alloy cylinder metal mould low-pressure casting, organize fine and close inadequately, problems such as cost is higher, location inaccuracy.
Technical problem solved by the invention can realize by the following technical solutions:
A kind of method for arranging of casting system of aluminium alloy cylinder metal mould low-pressure casting, cylinder body combustion front are downwards the low-pressure casting process characteristics.There are backform, four side forms, bed die and mould bases in the mould outside of casting, it is characterized in that cast gate is arranged on the bed die, and bed die is corresponding with the combustion chamber face that casts out, and will locate benchmark and all design on plane on the bed die;
The parts of backform, four formation moulds such as side form, bed die and mould bases are assembled up, constitute mould;
Be coated with the coating that prevents liquid metal and mould bonding on the die assembly surface;
By the pressurization of liquid towards metal, liquid metal is flowed into from cast gate, be full of mould cavity;
Mold temperature is controlled, and temperature is reduced to backform gradually by bed die.
Bed die is provided with four cast gates, the location benchmark all design on plane on the bed die, be meant Cast iron liner is arranged on the bed die, sand core of water jacket, oil duct sand and processing dimension location benchmark, be provided with water jacket positioning seat, oil duct positioning seat, cylinder sleeve positioning seat.
Thick by being thinned to by backform, side form, bed die order during to mould coating, coating is selected by heat-insulating property, that is: strengthen gradually to bed die coating heat-insulating property from backform.
150-250 ℃ of backform temperature, 250-350 ℃ of side form temperature, 300-450 ℃ of bed die temperature, control mold temperature in conjunction with the pressure type of cooling during casting, backform uses water-cooled, and side form uses air-cooled, and bed die does not adopt cooling provision, naturally cooling, thus make the bed die cast gate become consecutive solidification feeding terminal surface.
Use the present invention, since cast gate be arranged on the corresponding bed die of combustion chamber face on, adopt cylinder body combustion chamber face to do gate land, it is very big to save the volume that designs in the conventional gravity foundry technology, the rising head that is used for feeding, thereby save a bigger rising head core, save wide variety of materials and manpower, saved cost.Gate land adopts four cast gates, and cast gate is a consecutive solidification feeding stop bit on the bed die, guarantees cylinder body from top to bottom, consecutive solidification, thus solved problem and the fine and close inadequately problem of interior tissue that shrinkage porosite appears in casting process medium casting inside.To locate benchmark all design because all location benchmark all on a module, make the location more accurate, solved the coarse problem in location in the casting process at cylinder body combustion chamber face.
Description of drawings
Fig. 1 is the mold integral structural representation of casting;
The last figure of Fig. 2 is a bed die Facad structure schematic diagram, and figure below is a bed die side structure schematic diagram.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
A kind of method for arranging of casting system of aluminium alloy cylinder metal mould low-pressure casting, there are backform 1, four side forms 2, bed die 3 and mould bases in the mould outside of casting, it is characterized in that, cast gate 5 is arranged on the bed die 3, bed die 3 is corresponding with combustion chamber face 4, be provided with cast gate 5, will locate benchmark and all design on plane on the bed die 3;
Be coated with the coating that prevents liquid metal and mould bonding during casting on the die assembly surface;
The parts of backform 1, four formation moulds such as side form 2, bed die 3 and mould bases are assembled up, constitute mould;
By the pressurization of liquid towards metal, liquid metal is flowed into from cast gate 5, be full of mould;
Mold temperature is controlled, and temperature is reduced to backform 1 gradually by bed die 3.
Bed die 3 is provided with four cast gates 5, the location benchmark all designs on plane on the bed die 3, be meant Cast iron liner is arranged on the bed die 3, jacket core, oil duct core and processing dimension location benchmark, be provided with water jacket positioning seat 6, water jacket positioning seat 7, oil duct positioning seat 8, oil duct positioning seat 9, cylinder sleeve positioning seat 10.
Thick by being thinned to by backform 1, side form 2, bed die 3 orders during to mould coating, coating is selected by heat-insulating property, and also 2 coating heat-insulating properties strengthen gradually from backform 1 to bed die.
Backform 1 temperature 150-250 ℃, side form 2 temperature 250-350 ℃, bed die 3 temperature 300-450 ℃, control mold temperature in conjunction with the pressure type of cooling during casting, backform 1 uses water-cooled, and side form 2 uses air-cooled, and bed die 3 does not adopt cooling provision, naturally cooling, thus make cast gate 5 become consecutive solidification feeding final position.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (4)
1. the method for arranging of the casting system of an aluminium alloy cylinder metal mould low-pressure casting is characterized in that, cast gate is arranged on the bed die, and bed die is corresponding with the combustion chamber face, will locate benchmark and all design on plane on the bed die; Be coated with the coating that prevents liquid metal and mould bonding on the die assembly surface; The parts of backform, four side forms, bed die and mould bases formation moulds are assembled up, constitute mould; Liquid metal is pressed into mould by cast gate, and is full of mould; Mold temperature is controlled, and temperature is reduced to backform gradually by bed die.
2. the method for arranging of the casting system of a kind of aluminium alloy cylinder metal mould low-pressure casting according to claim 1, it is characterized in that, bed die is provided with four cast gates, Cast iron liner, sand core of water jacket, oil passage sand core location benchmark are arranged on the bed die, and bed die is provided with water jacket positioning seat, oil duct positioning seat, cylinder sleeve positioning seat, processing dimension anchor point.
3. the method for arranging of the casting system of a kind of aluminium alloy cylinder metal mould low-pressure casting according to claim 1, it is characterized in that, thick by being thinned to during to mould coating by backform, side form, bed die order, coating is selected by heat-insulating property, also strengthens gradually to bed die coating heat-insulating property from backform.
4. the method for arranging of the casting system of a kind of aluminium alloy cylinder metal mould low-pressure casting according to claim 1, it is characterized in that, 150-250 ℃ of backform temperature, 250-350 ℃ of side form temperature, 300-450 ℃ of bed die temperature, control mold temperature in conjunction with the pressure type of cooling during casting, backform uses water-cooled, and side form uses air-cooled, and bed die does not adopt cooling provision, naturally cooling, cast gate becomes consecutive solidification feeding termination position on the bed die thereby make.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100333748A CN101497120B (en) | 2008-01-31 | 2008-01-31 | Arrangement method of casting system of aluminium alloy cylinder metal mould low-pressure casting |
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| CN2008100333748A CN101497120B (en) | 2008-01-31 | 2008-01-31 | Arrangement method of casting system of aluminium alloy cylinder metal mould low-pressure casting |
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| CN101497120A CN101497120A (en) | 2009-08-05 |
| CN101497120B true CN101497120B (en) | 2010-11-10 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102019362A (en) * | 2009-09-22 | 2011-04-20 | 广西玉柴机器股份有限公司 | Die and method for casting crankcase |
| CN102534162A (en) * | 2012-02-28 | 2012-07-04 | 重庆登科金属制品有限公司 | Instantaneous cooling technique of gasoline engine cylinder |
| CN103372639A (en) * | 2012-04-24 | 2013-10-30 | 太仓子午电气有限公司 | Low pressure casting mould |
| CN103506604B (en) * | 2012-06-25 | 2015-11-25 | 无锡蠡湖叶轮制造有限公司 | The casting method of long runner thin wall type casing |
| CN103658544B (en) * | 2013-12-06 | 2017-11-07 | 哈尔滨东安发动机（集团）有限公司 | Designing and preparation method for conversion-free preliminary processing reference integral sand core |
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| CN2707403Y (en) * | 2004-06-25 | 2005-07-06 | 宁波市北仑模具压铸有限公司 | Die-casting mould for cylinder |
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Patent Citations (2)
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|---|---|---|---|---|
| CN1688402A (en) * | 2002-10-03 | 2005-10-26 | 特拉华机器及工具公司 | Method and apparatus for die-casting a V-cylinder block for an internal combustion engine |
| CN2707403Y (en) * | 2004-06-25 | 2005-07-06 | 宁波市北仑模具压铸有限公司 | Die-casting mould for cylinder |
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